Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India

N. Mohammed Nishath; S. M. Hussain; K. Neelavnnan; S. Thejasino; S. Saalim; A. Rajkumar

doi:10.1016/j.palaeo.2017.05.004

Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India

N. Mohammed Nishath
, S. M. Hussain^*
, K. Neelavnnan
, S. Thejasino
, S. Saalim
, A. Rajkumar

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Thirty seven surface sediment samples collected through a multi-corer in seven transects of ORV Sagar Kanya, SK 308 Leg-1 from off central Bay of Bengal (shelf to slope environment) were analysed for living and dead Ostracoda. The samples, which ranged in water depth from ~ 29 m to 2540 m, yielded a total of 46 species belonging to 32 genera. The ostracod fauna of the Bay of Bengal exhibit a depth-related distribution that is controlled by substrate and hydrographic conditions. Sandy substrates of shallow water depth (~ 28 m) are characterized by Propontocypris sp. and Cytherelloidea malaccaensis. These species are replaced by Neonesidea cracenticlavula and Bairdoppilata paraalcyonicola in high population, which shows positive linear correlation with salinity, temperature and Total Calcium Carbonate (TCC) in the outer shelf ~ 55–73 m. Paijenborchella sp. dominates at ~ 763 m in the bathypelagic zone, giving way to Parakrithella sp. at greater depths of ~ 2540 m on soft-bottom substrates. The fauna represents an interesting mixture of displaced species and others known from bathyal and abyssal depths in the Bay of Bengal, including some pandemic deep sea species. The ostracod faunal diversity is higher in shallower water than in the deeper water, which may be due to the optimum temperature, pH, salinity and substrate. The fauna are comprised of three associations (Shelf/Upper Slope; Slope; Lower Slope/Abyss). A marked faunal turnover occurs at the outer-shelf. Factor Analysis was performed to determine the correlation of water and sediment parameters with the ostracod species. This study provides a detailed account of bathymetry and ostracod biodiversity recorded in the study area.

Original language	English
Pages (from-to)	70-82
Number of pages	13
Journal	Palaeogeography, Palaeoclimatology, Palaeoecology
Volume	483
DOIs	https://doi.org/10.1016/j.palaeo.2017.05.004
State	Published - 1 Oct 2017

Bibliographical note

Funding Information:
Authors are thankful to Ministry of Earth Sciences (MoES), New Delhi and Dr. Rajiv Nigam for providing financial support to carry out this research work (MoES/Siber/NIO (RN)/11, dated 30th March, 2012). They are very much thankful to Dr. Rajeev Saraswat, Scientist, NIO, Goa and his team for their help in sample collection and also for providing water and sediment parameter data. Mrs. Kresna Tri Dewi, Marine Geological Institute, Indonesia and Dr. Patrick de Deckker, Emeritus Professor, ANU College of Physical and Mathematical Sciences, Australian National University acknowledged for the suggestions. Thanks are also due to SAIF, IIT-Madras for providing HR-SEM for ostracod photomicrographs. Thanks are also due to the anonymous reviewers for their constructive suggestions to improve the quality of the manuscript. Authors also thank Head of the Department of Geology, University of Madras for encouragement and providing facilities to carry out this work.

Publisher Copyright:
© 2017

Keywords

Bathymetry
Biodiversity
Ostracoda
Shelf to slope and Bay of Bengal

ASJC Scopus subject areas

Oceanography
Ecology, Evolution, Behavior and Systematics
Earth-Surface Processes
Paleontology

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10.1016/j.palaeo.2017.05.004

Cite this

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title = "Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India",

abstract = "Thirty seven surface sediment samples collected through a multi-corer in seven transects of ORV Sagar Kanya, SK 308 Leg-1 from off central Bay of Bengal (shelf to slope environment) were analysed for living and dead Ostracoda. The samples, which ranged in water depth from \textasciitilde{} 29 m to 2540 m, yielded a total of 46 species belonging to 32 genera. The ostracod fauna of the Bay of Bengal exhibit a depth-related distribution that is controlled by substrate and hydrographic conditions. Sandy substrates of shallow water depth (\textasciitilde{} 28 m) are characterized by Propontocypris sp. and Cytherelloidea malaccaensis. These species are replaced by Neonesidea cracenticlavula and Bairdoppilata paraalcyonicola in high population, which shows positive linear correlation with salinity, temperature and Total Calcium Carbonate (TCC) in the outer shelf \textasciitilde{} 55–73 m. Paijenborchella sp. dominates at \textasciitilde{} 763 m in the bathypelagic zone, giving way to Parakrithella sp. at greater depths of \textasciitilde{} 2540 m on soft-bottom substrates. The fauna represents an interesting mixture of displaced species and others known from bathyal and abyssal depths in the Bay of Bengal, including some pandemic deep sea species. The ostracod faunal diversity is higher in shallower water than in the deeper water, which may be due to the optimum temperature, pH, salinity and substrate. The fauna are comprised of three associations (Shelf/Upper Slope; Slope; Lower Slope/Abyss). A marked faunal turnover occurs at the outer-shelf. Factor Analysis was performed to determine the correlation of water and sediment parameters with the ostracod species. This study provides a detailed account of bathymetry and ostracod biodiversity recorded in the study area.",

keywords = "Bathymetry, Biodiversity, Ostracoda, Shelf to slope and Bay of Bengal",

author = "\{Mohammed Nishath\}, N. and Hussain, \{S. M.\} and K. Neelavnnan and S. Thejasino and S. Saalim and A. Rajkumar",

note = "Funding Information: Authors are thankful to Ministry of Earth Sciences (MoES), New Delhi and Dr. Rajiv Nigam for providing financial support to carry out this research work (MoES/Siber/NIO (RN)/11, dated 30th March, 2012). They are very much thankful to Dr. Rajeev Saraswat, Scientist, NIO, Goa and his team for their help in sample collection and also for providing water and sediment parameter data. Mrs. Kresna Tri Dewi, Marine Geological Institute, Indonesia and Dr. Patrick de Deckker, Emeritus Professor, ANU College of Physical and Mathematical Sciences, Australian National University acknowledged for the suggestions. Thanks are also due to SAIF, IIT-Madras for providing HR-SEM for ostracod photomicrographs. Thanks are also due to the anonymous reviewers for their constructive suggestions to improve the quality of the manuscript. Authors also thank Head of the Department of Geology, University of Madras for encouragement and providing facilities to carry out this work. Publisher Copyright: {\textcopyright} 2017",

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doi = "10.1016/j.palaeo.2017.05.004",

language = "English",

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journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",

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TY - JOUR

T1 - Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India

AU - Mohammed Nishath, N.

AU - Hussain, S. M.

AU - Neelavnnan, K.

AU - Thejasino, S.

AU - Saalim, S.

AU - Rajkumar, A.

N1 - Funding Information: Authors are thankful to Ministry of Earth Sciences (MoES), New Delhi and Dr. Rajiv Nigam for providing financial support to carry out this research work (MoES/Siber/NIO (RN)/11, dated 30th March, 2012). They are very much thankful to Dr. Rajeev Saraswat, Scientist, NIO, Goa and his team for their help in sample collection and also for providing water and sediment parameter data. Mrs. Kresna Tri Dewi, Marine Geological Institute, Indonesia and Dr. Patrick de Deckker, Emeritus Professor, ANU College of Physical and Mathematical Sciences, Australian National University acknowledged for the suggestions. Thanks are also due to SAIF, IIT-Madras for providing HR-SEM for ostracod photomicrographs. Thanks are also due to the anonymous reviewers for their constructive suggestions to improve the quality of the manuscript. Authors also thank Head of the Department of Geology, University of Madras for encouragement and providing facilities to carry out this work. Publisher Copyright: © 2017

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N2 - Thirty seven surface sediment samples collected through a multi-corer in seven transects of ORV Sagar Kanya, SK 308 Leg-1 from off central Bay of Bengal (shelf to slope environment) were analysed for living and dead Ostracoda. The samples, which ranged in water depth from ~ 29 m to 2540 m, yielded a total of 46 species belonging to 32 genera. The ostracod fauna of the Bay of Bengal exhibit a depth-related distribution that is controlled by substrate and hydrographic conditions. Sandy substrates of shallow water depth (~ 28 m) are characterized by Propontocypris sp. and Cytherelloidea malaccaensis. These species are replaced by Neonesidea cracenticlavula and Bairdoppilata paraalcyonicola in high population, which shows positive linear correlation with salinity, temperature and Total Calcium Carbonate (TCC) in the outer shelf ~ 55–73 m. Paijenborchella sp. dominates at ~ 763 m in the bathypelagic zone, giving way to Parakrithella sp. at greater depths of ~ 2540 m on soft-bottom substrates. The fauna represents an interesting mixture of displaced species and others known from bathyal and abyssal depths in the Bay of Bengal, including some pandemic deep sea species. The ostracod faunal diversity is higher in shallower water than in the deeper water, which may be due to the optimum temperature, pH, salinity and substrate. The fauna are comprised of three associations (Shelf/Upper Slope; Slope; Lower Slope/Abyss). A marked faunal turnover occurs at the outer-shelf. Factor Analysis was performed to determine the correlation of water and sediment parameters with the ostracod species. This study provides a detailed account of bathymetry and ostracod biodiversity recorded in the study area.

AB - Thirty seven surface sediment samples collected through a multi-corer in seven transects of ORV Sagar Kanya, SK 308 Leg-1 from off central Bay of Bengal (shelf to slope environment) were analysed for living and dead Ostracoda. The samples, which ranged in water depth from ~ 29 m to 2540 m, yielded a total of 46 species belonging to 32 genera. The ostracod fauna of the Bay of Bengal exhibit a depth-related distribution that is controlled by substrate and hydrographic conditions. Sandy substrates of shallow water depth (~ 28 m) are characterized by Propontocypris sp. and Cytherelloidea malaccaensis. These species are replaced by Neonesidea cracenticlavula and Bairdoppilata paraalcyonicola in high population, which shows positive linear correlation with salinity, temperature and Total Calcium Carbonate (TCC) in the outer shelf ~ 55–73 m. Paijenborchella sp. dominates at ~ 763 m in the bathypelagic zone, giving way to Parakrithella sp. at greater depths of ~ 2540 m on soft-bottom substrates. The fauna represents an interesting mixture of displaced species and others known from bathyal and abyssal depths in the Bay of Bengal, including some pandemic deep sea species. The ostracod faunal diversity is higher in shallower water than in the deeper water, which may be due to the optimum temperature, pH, salinity and substrate. The fauna are comprised of three associations (Shelf/Upper Slope; Slope; Lower Slope/Abyss). A marked faunal turnover occurs at the outer-shelf. Factor Analysis was performed to determine the correlation of water and sediment parameters with the ostracod species. This study provides a detailed account of bathymetry and ostracod biodiversity recorded in the study area.

KW - Bathymetry

KW - Biodiversity

KW - Ostracoda

KW - Shelf to slope and Bay of Bengal

UR - https://www.scopus.com/pages/publications/85019103511

U2 - 10.1016/j.palaeo.2017.05.004

DO - 10.1016/j.palaeo.2017.05.004

M3 - Article

AN - SCOPUS:85019103511

SN - 0031-0182

VL - 483

SP - 70

EP - 82

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

ER -

Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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